Floor structure

ABSTRACT

The present invention makes it possible to dismantle and re-use a floor structure by effectively exhibiting the displacement preventing effect for each steel stock against an active load in case the floor structure is formed by arranged steel stocks in parallel. A floor structure comprises a plurality of steel stocks  4  arranged in parallel, each steel stock  4  including a web  1,  an upper flange  2  disposed at an upper end of the web  1 , and a lower flange  3  disposed at a lower end of the web  1 , a floor surface being formed on the upper flange  2,  the floor structure further comprising a displacement preventing spacer  6  interposed between the upper flanges  2  and/or lower flanges  3  of the adjacent steel stocks  4,  the displacement preventing spacer  6  including a load receiving part  7  which is brought into engagement with the adjacent upper flanges  2  and/or lower flanges  3  to receive an active load incurred to the individual steel stocks  4  so as to inhibit the steel stocks  4  from displacing downward.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a floor structure such as afloor plate bridge structure built on a river or a land, a slabstructure of respective hierarchies such as a steel frame building andan iron reinforcement concrete building, a roadbed structure formed onan upper surface of an underground construction, a roadbed structurelaid on a ground surface, or the like.

[0003] 2. Related Art

[0004] Patent Document 1 shows a bridge structure, in which steel stockseach consisting of an upper flange, a lower flange and a web arearranged in parallel, an iron reinforcement is arranged and a concreteis placed between the adjacent steel stocks, i.e., in a space defined byupper and lower flanges of the adjacent steel stocks and the web, andthe iron reinforcement concrete and the web are tightly connected toeach other by a PC steel stock piercing the iron reinforcement concreteand the web in the width direction of the bridge.

[0005] The above bridge structure is based on such a designing idea thatthe bridge strength against an active load such as vehicles is borne byan iron reinforcement concrete placed between the adjacent steel stocks.

[0006] Moreover, the slab structure of the respective hierarchies of theconventional steel frame building is formed by supporting a floor plateby beam members, and the slab structure of the respective hierarchies ofthe iron reinforcement concrete building is normally formed with amonolithically placed concrete. Likewise, the roadbed structuretemporarily laid on the upper surface of an underground constructionemploys a method in which iron plates are supported by beam members, andthe construction site where trucks and heavy machines frequently come inand out, typically employs a method in which iron plates are merely laidon a ground surface to form a temporary roadbed.

[0007] It should be noted that the “Patent Document 1” mentioned aboverefers to Official Gazette of Japanese Patent Application Laid-Open No.H08-253912

[0008] Problems to be Solved by the Invention

[0009] However, the bridge shown in the above-mentioned Patent Document1 is a structure in which the integration is achieved by the steelstocks and the iron reinforcement concrete placed at the site, and noconsideration is given at all to a unit structure in which the steelstocks are dismantled one by one and re-used.

[0010] Therefore, the conventional technique is not suited as a floorstructure of a temporarily built bridge and the like. At the time ofrebuilding, a large scale dismantling operation and a large amount ofdismantling expense are required Moreover, a great deal of scrap isproduced thereby to impair the environment. In addition, the formassembling process, the bar arranging process and the concrete placingprocess are required, thus resulting in increased construction cost.

[0011] On the other hand, in the above-mentioned roadbed structure, manyheavy iron plates are required to be laid or recovered, a step and a gapare formed between the adjacent iron plates, and overly walking noisesare generated. Thus, the conventional structure is difficult to say asthe original floor structure in view of strength and appearance.

[0012] Moreover, in case a slab is formed by integral placement ofconcrete in a concrete building, a complicated form assembling processis required, and much time and labor is required for installation andremoval of many jacks. When it is taken into consideration of anadditional need for concrete curing, etc., the period required for thetotal construction process is increased and the total construction costis increased, too.

[0013] Furthermore, it is customary in a steel fame building that thatload is supported by a joist which is horizontally disposed between afloor plate and a beam member. However, deflection and creaking areliable to occur. Moreover, much time and labor is required forconstructing a joist, a floor plate and a ceiling plate.

SUMMARY OF THE INVENTION

[0014] Object of the Invention

[0015] It is, therefore, an object of the present invention to provide,a bridge floor structure in a floor plate bridge, a floor structure in asteel frame building, a floor structure and an iron reinforcementbuilding, a floor structure on an upper surface of an undergroundconstruction, and a floor structure laid on a ground surface, which arecapable of solving the above-mentioned problems.

[0016] Means for Solving the Problems

[0017] A floor structure according to the present invention comprises aplurality of steel stocks arranged in parallel, each steel stockincluding a web, an upper flange disposed at an upper end of the web,and a lower flange disposed at a lower end of the web, a floor surfacebeing formed on the upper flange, the floor structure further comprisinga displacement preventing spacer interposed between the upper flangesand/or lower flanges of the adjacent steel stocks, the displacementpreventing spacer including a load receiving part which is brought intoengagement with the adjacent upper flanges and/or lower flanges toreceive an active load incurred to the individual steel stocks so as toinhibit the steel stocks from displacing downward.

[0018] As one embodiment thereof, the floor structure further comprisesa displacement preventing spacer, the displacement preventing spacerincluding a left fitting part fitted between the upper and lower flangesof the adjacent left side steel stocks, a right fitting part fittedbetween the upper and lower flanges of the adjacent right side steelstocks, an upper interposing part interposed between the upper flangesof the adjacent steel stocks, and a lower interposing part interposedbetween the adjacent lower flanges.

[0019] Left side upper and lower step parts formed at an interlockingpart between the upper and lower interposing parts and the left fittingpart are engaged with a lower surface of the upper flange and an uppersurface of the lower flange of the left side steel stock, right sideupper and lower step parts formed at an interlocking part between theupper and lower interposing parts and the right fitting part beingengaged with a lower surface of the upper flange and an upper surface ofthe lower flange of the right side steel stock, owing to thoseengagements, the steel individual stocks being inhibited from beingdisplaced downward.

[0020] As another embodiment, in the floor structure using the H-shapedsteel, the floor structure further comprises a left displacementpreventing block fitted to a space defined between the upper and lowerflanges and the web of the adjacent left side steel stocks, and a rightdisplacement preventing block fitted to a space defined between theupper and lower flanges and the web of the adjacent right side steelstocks, mutually opposing side surfaces of the left and rightdisplacement preventing blocks being press butted between the adjacentsteel stocks, the individual steel stocks being inhibited fromdisplacing downward due to a surface pressure and a friction engagementbetween the press butted surfaces.

[0021] As a further embodiment, in the floor structure using theH-shaped steel, the floor structure flirter comprises a leftdisplacement preventing block fitted to a space defined between theupper and lower flanges and the web of the adjacent left side steelstocks, and a right displacement preventing block fitted to a spacedefined between the upper and lower flanges and the web of the adjacentright side steel stocks, mutually opposing side surfaces of the left andright displacement preventing blocks being press butted between theadjacent steel stocks, a mutually engaging concave and convex part or astep part being formed on the two press butted surfaces, therebyinhibiting the individual steel stocks from being displaced downward.

[0022] Preferably, the left and right displacement preventing blocks areformed of a wood, or lightweight cellular concrete or rigid foamedresin.

[0023] The floor structure is effective as displacement means against anactive load in case a floor structure is formed by arranging steelstocks in parallel. The displacement spacer is preliminarily prepared,and the displacement preventing spacer is fitted between the steelstocks which are arranged in parallel. By doing so, the individual steelstocks is effectively prevented from being displaced downward againstthe active load.

[0024] Likewise, the preliminarily prepared left and right displacementpreventing blocks are fitted to each steel stock, and two such blocksare merely press butted with each other while arranging the steel stocksin parallel. By doing so, the vertical displacement effect can properlybe obtained against the active load.

[0025] In any of the above cases, the floor structure can easily beassembled using steel stocks, and the cost down can be achieved.

[0026] Moreover, in any of the above cases, the floor structure can bemade into a unit structure, and dismantling and re-use are possible.

BRIEF DESCRIPTION OF THE DRAWING

[0027]FIG. 1 is a sectional view of a floor structure showing a firstembodiment using a displacement preventing spacer.

[0028]FIG. 2 is a sectional view of a floor structure showing a secondembodiment using a displacement preventing spacer.

[0029]FIG. 3 is a sectional view of a floor structure showing a thirdembodiment using a displacement preventing spacer.

[0030]FIG. 4 is a sectional view of a floor structure showing a fourthembodiment using a displacement preventing spacer.

[0031]FIG. 5 is a sectional view of a floor structure showing the firstembodiment using a displacement preventing block.

[0032]FIG. 6 is a sectional view of a floor structure showing the secondembodiment using a displacement preventing block.

[0033]FIG. 7 is a sectional view of a floor structure showing the thirdembodiment using a displacement preventing block.

[0034]FIG. 8 is a sectional view exemplifying an attachment structurefor attaching the displacement preventing block to the steel stock inthe above-mentioned respective embodiments.

[0035]FIG. 9(A) is a sectional view showing an example in which alaminated wood is used as the displacement preventing block.

[0036]FIG. 9(B) is a sectional view showing another example in which atube member is used as the displacement preventing block.

[0037]FIG. 10(A) is a side view, in the axial direction of a steelstock, of a floor structure using the above displacement preventingspacer.

[0038]FIG. 10(B) is a side view, in the axial direction of a steelstock, of a floor structure using the above displacement preventingblock.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] Embodiments of a floor structure according to the presentinvention will be described hereinafter with reference to FIGS. 1through 10.

[0040] The floor structures shown in FIGS. 1 through 10 show a bridgefloor structure in a floor plate bridge, a floor structure in a steelframe building and an iron reinforcement concrete building, a floorstructure of an upper surface of an underground construction, and afloor structure laid on a ground surface, in which a plurality of steelstocks 4 each having an upper flange 2 at the upper end of a web 1 and alower flange 3 at the lower end are arranged in parallel, and a floorsurface is formed on the upper flange 2.

[0041] The steel stock 4 is obtained by welding the upper flange 2,which bulges out symmetrically in the left and right direction, to theupper end of the web 1 and welding the lower flange 3, which bulges outsymmetrically in the left and right direction, to the lower end of theweb 1, so that the resultant steel stock 4 exhibits an H-shape.Preferably, a general purpose H-steel as specified in Japan IndustrialStandards is employed as it is.

[0042] In case the floor structure is a floor plate bridge, the oppositeends of the steel stock 4 (floor structure), i.e., the opposite ends ofthe lower flanges 3 are supported between piers 5 in a suspendingmanner. In this case, the steel stock 4 constitutes a main girder.

[0043] In case of a building, the opposite ends of the steel stock 4(floor structure), i-e., the opposite ends of the lower flange 3 aresupported between vertical walls in a suspending manner to thereby forma slab of respective hierarchies. In case a roadbed is formed on aground surface, the steel stock 4 (floor structure) is laid on a groundsurface through the lower flange 3. Also, the steel stock (floorstructure) is laid on a scaffolding constructed in an underground spacethrough the lower flange 3, and the floor surface is formed on the upperflange 2 in each exemplified case.

[0044] As a common structure shown in FIGS. 1 through 4, in the floorstructure, a displacement spacer 6 is interposed between the upperflanges and/or the lower flanges 3 of the adjacent steel stocks, a loadreceiving part 7 of the displacement preventing spacer 6 is brought intoengagement with the adjacent upper flanges 2 and/or the adjacent lowerflanges 3 to receive an active load incurred to the individual steelstocks 4 so as to inhibit the individual steel stocks 4 from displacingdownward. That is, the active load incurred to the individual steelstocks 4 is incurred to the adjacent steel stocks 4 through thedisplacement preventing spacer 6 such that the load is incurred to theentirety and dispersed.

[0045] As its first embodiment, as shown in FIGS. 1 and 2, the floorstructure further comprises a displacement preventing spacer 6interposed between the upper flanges 2 and the lower flanges 3 of theadjacent steel stocks 4, the displacement preventing spacer 6 includes aleft fitting part 8 fitted between the upper and lower flanges 2, 3 ofthe adjacent left side steel stocks 4, a right fitting part 9 fittedbetween the upper and lower flanges 2, 3 of the adjacent right sidesteel stocks 4, an upper interposing part 10 interposed between theupper flanges 2 of the adjacent steel stocks 4, and a lower interposingpart 11 interposed between the adjacent lower flanges 3.

[0046] A left side upper step part 12 formed at an interlocking partbetween the upper interposing part 10 and the left fitting part 8 isengaged with a lower surface of the upper flange 2 of the left sidesteel stock 4 and a left side lower step part 13 formed at aninterlocking part between the upper interposing part 10 and the leftfitting part 8 is engaged with an upper surface of the lower flange 3 ofthe left side steel stock 4.

[0047] At the same time, a right side upper step part 14 formed at aninterlocking part between the upper interposing part 10 and the rightfitting part 9 is engaged with a lower surface of the upper flange 2 ofthe right side steel stock 4 and a right side lower step part 15 formedat an interlocking part between the upper interposing part 10 and theright fitting part 9 is engaged with an upper surface of the lowerflange 3 of the right side steel stock 4. Owing to those engagements,the individual steel stocks 4 are inhibited from being displaceddownward.

[0048] As a second embodiment, as shown in FIG. 2, the displacementpreventing spacer 6 is provided at an upper end of the upper interposingpart 10 with an upper engagement part 18 which is engaged with uppersurfaces of the upper flanges 2 of the adjacent steel stocks 4, and thedisplacement preventing spacer 6 is provided at a lower end of the lowerinterposing part 11 with a lower engagement part 19 which is engagedwith lower surfaces of the lower flanges 3 of the adjacent steel stocks4.

[0049] That is, the displacement preventing spacer 6 is provided at theleft and right of the upper interposing part 10 with upper engagementgrooves 16. The upper flanges 2 of the adjacent steel stocks 4 arebrought into engagement with the left and right upper engagement grooves16, thereby resting the upper flanges 2 Thus, the load receiving part 7is formed by the pair of upper step parts 12, 14 which define the leftand right upper engagement grooves 16.

[0050] Likewise, the displacement preventing spacer 6 is provided at theleft and right of the lower interposing part 11 with lower engagementgrooves 17. The lower flanges 3 of the adjacent steel stocks 4 arebrought into engagement with the left and right lower engagement grooves17, thereby restraining the lower flanges 3. Thus, the load receivingpart 7 is formed by the pair of upper step parts 13, 15 which define theleft and right lower engagement grooves 17.

[0051] As a third embodiment, as shown in FIG. 3, the displacementpreventing spacer 6 is separated into an upper displacement preventingspacer 6′ interposed between the upper flanges 2 of the adjacent steelstocks 4, and a lower displacement preventing spacer 6″ interposedbetween the lower flanges 3 of the adjacent steel stocks 4 (namely, thespacer 6 is formed of separate members). The load receiving parts 7 ofthe respective displacement preventing spacers 6′, 6″ are brought intoengagement with the adjacent upper flanges 2 and the adjacent lowerflanges 3 to receive the active load incurred to the individual steelstocks 4, so that the individual steel stocks 4 are inhibited fromdisplacing downward. That is, the load incurred to the individual steelstocks 4 is incurred to the adjacent steel stocks 4 through thedisplacement spacers 6′, 6″ and the load is dispersed to the entirety.

[0052] More specifically, as shown in FIG. 3, upper engagement grooves16 are formed at the left and right parts of the upper interposing part10 of the upper displacement preventing spacer 6′, and the upper flanges2 of the adjacent steel stocks 4 are brought into engagement with theengagement grooves 16, respectively. Thus, the load receiving part 7 isformed by the pair of upper step parts 12, 14 which define the left andright upper engagement grooves 16.

[0053] That is, the upper engagement parts 18 which define the upperengagement grooves 16 of the upper displacement spacer 6′ are broughtinto engagement with the upper surfaces of the upper flanges 2 of theadjacent steel stocks 4, and the lower engagement parts 19 are likewisebrought into engagement with the lower surfaces of the upper flanges 2of the adjacent steel stocks 4, respectively, and the load receivingpart 7 against the active load is formed by the step parts 12, 14 formedat the interlocking part between the upper engagement part 18 formingthe upper engagement groove 16 and the upper interposing part 10, andthe step parts 12, 14 formed at the interlocking part between the lowerengagement part 19 and the upper interposing part 10, so that theindividual steel stocks 4 are inhibited from displacing downward.

[0054] Likewise, upper engagement grooves 17 are formed at the left andright parts of the lower interposing part 11 of the lower displacementpreventing spacer 6″, and the lower flanges 3 of the adjacent steelstocks 4 are brought into engagement with the engagement grooves 17,respectively. Thus, the load receiving part 7 is formed by the pair ofupper step parts 13, 15 which define the left and right lower engagementgrooves 17.

[0055] That is, the upper engagement parts 18 which define the lowerengagement grooves 17 of the lower displacement spacer 6″ are broughtinto engagement with the upper surfaces of the lower flanges 3 of theadjacent steel stocks 4, and the lower engagement parts 19 are likewisebrought into engagement with the lower surfaces of the lower flanges 3of the adjacent steel stocks 4, respectively, and the load receivingpart 7 against the active load is formed by the step parts 13, 15 formedat the interlocking part between the upper engagement part 18 formingthe lower engagement groove 17 and the lower interposing part 11, andthe step parts 13, 15 formed at the interlocking part between the lowerengagement part 19 and the lower interposing part 10, so that theindividual steel stocks 4 are inhibited from displacing downward.

[0056] As a fourth embodiment, as shown in FIG. 4, a displacementpreventing spacer 6 including an upper interposing part 10 interposedbetween the upper flanges 2 of the adjacent steel stocks 4, and a lowerinterposing part 11 interposed between the adjacent lower flanges 3 isinterposed between the adjacent steel stocks 4, the displacementpreventing spacer 6 is provided at an upper end thereof with an upperengagement part 18 which is engaged with the upper surfaces of the upperflanges 2 of the adjacent steel stocks 4, and the displacementpreventing spacer 6 is provided at a lower end thereof with a lowerengagement part 19 which is engaged with the lower surfaces of the lowerflanges 3 of the adjacent steel stocks 4.

[0057] Thus, the load receiving part 7 is formed by the step parts 12,14 which are formed at the interlocking part between the upperinterposing part 10 and the upper engagement part 18, and the loadreceiving part 7 is formed by the step parts 13, 15 which are formed atthe interlocking part between the lower interposing part 11 and thelower engagement part 19.

[0058] Owing to the above arrangement, the active load incurred to theindividual steel stocks 4 is received by the load receiving part 7, sothat the individual steel stocks 4 are inhibited from displacingdownward. That is, the active load incurred to the individual steelstocks 4 is incurred to the adjacent steel stocks 4 through the spacer6, and the load is incurred to the entirety and dispersed.

[0059] As other examples, as shown in FIGS. 5 through 8, In a floorstructure using the H-shaped steel, the floor structure furthercomprises a left displacement preventing block 20 fitted to a spacedefined between the upper and lower flanges 2, 3 and the web 1 of theadjacent left side steel stocks 4, and a right displacement preventingblock 20 fitted to a space defined between the upper and lower flanges2, 3 and the web 1 of the adjacent right side steel stocks 4. That is,each steel stock 4 includes left and right displacement preventingblocks 20.

[0060] While the steel stocks 4 are arranged in parallel, mutuallyopposing side surfaces 21 of the left and right displacement preventingblocks 20 are press butted between the adjacent steel stocks 4, and theindividual steel stocks 4 are inhibited from displacing downward due toa surface pressure and a friction engagement between the press buttedsurfaces 21.

[0061] Also, as shown in FIG. 7, in a floor structure using the H-shapedsteel, mutually opposing side surfaces 21 of the left and rightdisplacement preventing blocks 20 are press butted between the adjacentsteel stocks 4, and a mutually engaging concave part 22 and convex part23 or a step part are formed on the two press butted surfaces 21,thereby inhibiting the individual steel stocks 4 from being displaceddownward.

[0062] The left and right displacement preventing blocks 20 arerestricted at their upper surface and lower surface by a lower surfaceof the upper flange 2 and an upper surface of the lower flange 3,respectively, and one side surfaces (opposing side surfaces to thebutting surfaces) of the left and right displacement preventing blocks20 are restricted by the side surfaces of the web 1, and in thatcondition, the left and right displacement preventing blocks 20 arefitted to the left and right sides of the web 1.

[0063] In the example shown in FIG. 5, left and right displacementpreventing blocks 20 all having the same size are employed. The blocks20 are fitted to a left side space defined by the upper and lowerflanges 2, 3 and the web 1 of each steel stock 4, and they are also eachfitted to a right side space defined by the right side upper and lowerflanges 2, 3 and the web 1 of each steel stock 4.

[0064] In the left and right displacement preventing blocks 20, as shownin FIG. 8, a bolt 24 is allowed to pierce into the left and rightdisplacement preventing blocks 20 and opposite ends of the bolt 24 aretightened by nuts 26 in release holes 25 formed in opposing sidesurfaces 21 of the left and right displacement preventing blocks 20, sothat the steel stock 4 and the left and right displacement preventingblocks 20 are integrated.

[0065] The steel stocks 4 including the left and right displacementpreventing blocks 20 are arranged in parallel, such that thedisplacement preventing blocks 20 are press butted with each other.

[0066] In FIG. 5, the displacement preventing blocks 20 having a samesize are carried on the respective steel stocks 4, and the displacementpreventing blocks 20 are allowed to project from the end part of theupper flange 2 or from the end parts of the upper flange 2 and the lowerflange 3 so as to be subjected to the butting engagement.

[0067] On the other hand, in FIG. 6, a displacement preventing block 20allowed to protrude from one end part of the upper flange 2 or one endsof the upper flange 2 and the lower flange 3 are fitted to and carriedby the space (first space) formed on the left side (or right side) ofeach steel stock 4, and a protruded part of another displacementpreventing block 20, which is adjacent to the above-mentioned block 20,is allowed to sink in the space (second space) formed of the right side(left side) of the steel stock 4 so as to be fitted to and carried bythe second space.

[0068] Thus, the protruded part of the displacement preventing block 20of one of the adjacent steel stocks 4 is fitted to the space of the sinkdisplacement preventing block 20 of the other of adjacent steel stocks4, i.e., fitted between the upper and lower flanges 2, 3, while theopposing side surfaces 21 of the two displacement preventing blocks 20are butted with each other. This abutting surface 21 may take the formof a displacement preventing surface under the effect of the pressfriction engagement as shown in FIG. 5 or the form of a displacementpreventing surface under the effect of the concave-and-convex engagementas shown in FIG. 7. Also in this displacement preventing block 20, asshown in FIG. 8, the block 20 is integrated with the steel stocksthrough the bolt 24.

[0069] Preferably, the left and right displacement preventing blocks 20are formed of a wood, or lightweight cellular concrete or rigid foamedresin, so that the blocks 20 can be reduced in weight.

[0070] In the alternative, as shown in FIG. 9(A), a wood, for example, aspotless wood or a laminated wood, for example, quadrate wood columnsare laminated to form a quadrate laminated wood member, and the woodmembers thus obtained are used as the left and right displacementpreventing blocks 20.

[0071] In the alternative, the left and right displacement preventingblocks 20, as shown in FIG. 9(B), is composed of a metal made tube, forexample, a steel tube, a synthetic resin-made tube, or a concrete-madetube.

[0072] The displacement preventing spacer 6 interposed between theflanges as shown in FIGS. 1 through 4, and the left and rightdisplacement preventing blocks 20 as shown in FIGS. 5 through 9 areintegrally tightened with the respective steel stocks 4 through atightening wire rod 27.

[0073] That is, each displacement preventing spacer 6 and the web 1 areprovided with a through-hole 28 which is communicated in the floor widthdirection (arranging direction of the steel stocks), and each of theleft and right displacement preventing blocks 20 and the web 1 arelikewise provided with a through-hole which is communicated in the floorwidth direction (arranging direction of the steel stocks). An elongatetightening wire rod 27 is allowed to thrust in the through-hole 28, andnuts 29 are threadingly engaged with the opposite ends of the tighteningwire rod 27 and tightened, so that the displacement preventing spacer 6or the left and right displacement preventing blocks 20 and the entiresteel stocks 4 are integrally tightened.

[0074] The tightening wire rod 27 may be a steel wire or a spotlesssteel bar.

[0075] Thus, the displacement preventing spacer 6 is press tightenedbetween the upper flanges 2 and/or between the lower flanges 3 of everyadjacent steel stocks 4 and intimately contacted with the end parts ofthe flanges 2, 3.

[0076] Likewise, the left and right displacement preventing blocks 20are press tightened with the left and right side surfaces of the web 1of every adjacent steel stocks 4 and intimately contacted therewith. Atthe same time, the opposing side surfaces 21 of the left and rightdisplacement preventing blocks 20 are press butted with each other.

[0077] As shown in FIG. 10(A), the displacement preventing spacers 6 arespacedly arranged in the axial direction of the steel stock 4, orcontinuously arranged in a mutually intimately contacted manner in theaxial direction of the steel stock 4.

[0078] Likewise, as shown in FIG. 10(B), the left and right displacementpreventing blocks 20 are spacedly arranged in the axial direction of thesteel stock 4, or continuously arranged in a mutually intimatelycontacted manner in the axial direction of the steel stock 4.

[0079] The upper flange 2 and the lower flange 3 of the steel stock 4used herein may be of a structure mutually bulged out in equal width ora structure in which the upper flange 2 is dimensioned short and thelower flange 3 is dimensioned long in width.

[0080] In the above floor structure, the upper surface of the upperflange 2 of the steel stock 4 is formed directly into a floor surface,or a pavement 30 of concrete or asphalt or the like is applied to theupper surface of the upper flange 2 and its upper surface is formed intoa floor surface. In the alternative, a floor assembly is constructed onthe upper flange 2 of the floor structure using a joist and a floorplate, thereby a floor surface is formed on the upper flange 2.

[0081] Effect of the Invention

[0082] The present invention is extremely effective as displacementpreventing means against an active load in which a floor structure isformed by arranging steel stocks in parallel. That is, the steel stocksare arranged in parallel, and the displacement preventing spacer isfittingly interposed between the steel stocks. By doing so, theindividual steel stocks can effectively be prevented from displacingdownward which would otherwise occur due to active load.

[0083] Likewise, the left and right displacement preventing blocks arepreliminarily fitted to each steel stock, and such two steel blocks arearranged in parallel and merely press butted with each other. By doingso, the vertical displacement effect against the active load canproperly be obtained.

[0084] Also, in any of the above cases, a floor structure can easily beassembled using steel stocks, and the cost down can be achieved.

[0085] Moreover, in any of the above cases, the floor structure can beformed into a unit structure, and dismantling and re-use are possible.

1. A floor structure comprising a plurality of steel stocks arranged inparallel, each steel stock including a web, an upper flange disposed atan upper end of said web, and a lower flange disposed at a lower end ofsaid web, a floor surface being formed on said upper flange, said floorstructure further comprising a displacement preventing spacer interposedbetween said upper flanges and/or lower flanges of said adjacent steelstocks, said displacement preventing spacer including a load receivingpart which is brought into engagement with said adjacent upper flangesand/or lower flanges to receive an active load incurred to saidindividual steel stocks so as to inhibit said steel stocks fromdisplacing downward.
 2. A floor structure comprising a plurality ofsteel stocks arranged in parallel, each steel stock including a web, anupper flange disposed at an upper end of said web, and a lower flangedisposed at a lower end of said web, a floor surface being formed onsaid upper flange, said floor structure further comprising adisplacement preventing spacer interposed between said upper flanges andsaid lower flanges of said adjacent steel stocks, said displacementpreventing spacer including a left fitting part fitted between saidupper and lower flanges of said adjacent left side steel stocks, a rightfitting part fitted between said upper and lower flanges of saidadjacent right side steel stocks, an upper interposing part interposedbetween said upper flanges of said adjacent steel stocks, and a lowerinterposing part interposed between said adjacent lower flanges, leftside upper and lower step parts formed at an interlocking part betweensaid upper and lower interposing parts and said left fitting part beingengaged with a lower surface of said upper flange and an upper surfaceof said lower flange of said left side steel stock, right side upper andlower step parts formed at an interlocking part between said upper andlower interposing parts and said right fitting part being engaged with alower surface of said upper flange and an upper surface of said lowerflange of said right side steel stock, owing to those engagements, saidindividual steel stocks being inhibited from being displaced downward.3. A floor structure comprising a plurality of steel stocks arranged inparallel, each steel stock including a web, an upper flange disposed atan upper end of said web, and a lower flange disposed at a lower end ofsaid web, a floor surface being formed on said upper flange, said floorstructure further comprising a left displacement preventing block fittedto a space defined between said upper and lower flanges and said web ofsaid adjacent left side steel stocks, and a right displacementpreventing block fitted to a space defined between said upper and lowerflanges and said web of said adjacent right side steel stocks, mutuallyopposing side surfaces of said left and right displacement preventingblocks being press butted between said adjacent steel stocks, saidindividual steel stocks being inhibited from displacing downward due toa surface pressure and a friction engagement between said press buttedsurfaces.
 4. A floor structure comprising a plurality of steel stocksarranged in parallel, each steel stock including a web, an upper flangedisposed at an upper end of said web, and a lower flange disposed at alower end of said web, a floor surface being formed on said upperflange, said floor structure further comprising a left displacementpreventing block fitted to a space defined between said upper and lowerflanges and said web of said adjacent left side steel stocks, and aright displacement preventing block fitted to a space defined betweensaid upper and lower flanges and said web of said adjacent right sidesteel stocks, mutually opposing side surfaces of said left and rightdisplacement preventing blocks being press butted between said adjacentsteel stocks, a mutually engaging concave and convex part or a step partbeing formed on said two press butted surfaces, thereby inhibiting saidindividual steel stocks from being displaced downward.
 5. A floorstructure according to claim 3, wherein said left and right displacementpreventing blocks are formed of a wood, or lightweight cellular concreteor rigid foamed resin.
 6. A floor structure according to claim 4,wherein said left and right displacement preventing blocks are formed ofa wood, or lightweight cellular concrete or rigid foamed resin.